Cutting mechanism



Nov. 10, 1942.

L. A, MOORE CUTTING MECHANISM Original Filed Sept 23, 1940 Patented Nov.10, 1942 UNITED STATES rarest OFFICE CUTTING MECHANISM Originalapplication September 23, 1940, Serial Divided and this applicationSeptember 19, 1941, Serial No. 411,522

3 Claims.

This invention relates to cutting mechanism for cutting strip materialinto proper lengths to produce suitable blanks which by appropriatetreatment may readily be formed into desired articles.

My invention is directed to cutting mechanism of the character statedhaving means assuring quick and clean cutting of the strip material, bya sharp blow or stroke at the instant of the cutting operation. Morespecifically, I provide cooperating plate and die rolls and associatedelements, such that the rolls have abrupt relative, movement one towardthe other, when the cooperating cutting elements are brought intocooperating relation to one another. Further objects and advantages ofmy invention will appear from the detail description.

The cutting mechanism above referred to, though suitable for manypurposes, is particularly suitable for use in a machine for producingarticles from strip-cardboard, such as the machine disclosed in mycopending application for Trouser guard machine, filed September 23.1940, Serial No. 357,847, now Patent No. 2,268,767, of which the instantapplication is a division. Accordingly, I have illustrated the cuttingmechanism of my invention, by way of example, as applied to the machineof my above identified patent, showing those parts of the machine whichcontribute to a clear understanding of the construction and operation ofthe mechanism of the instant invention.

In the drawing:

Figure 1 is a semidiagrammatic lengthwise central vertical sectionalview of a portion of the machine of my above identified patent embodyingtherein the mechanism of my present invention;

Figure 2 is a side view, partly broken away, of the gears at one end ofthe cutting rolls;

Figure 3 is a side View, partly broken away. of the rails at one end ofthe cutting rolls; and

Figure 4 is an isometric view of one of the die blocks and the cuttingdies and associated parts carried thereby.

The machine comprises a suitably constructed main frame 35 supported byappropriately located base frames, one of which is shown at 31, whichbase frames may be enclosed in a suitable manner to provide housingsavailable for storage or other purposes. Strip cardboard, or othersuitable material, is trimmed and/or slit to provide three strips 45 ofappropriate width each of which is delivered to suitable guide means2!!! having aslsociated upper andlower rubber covered pulling rollers222 and 223, respectively, supported from a frame 229, suitable meansbeing provided for yieldably urging roller 223 upward for gripping strip45, and roller 222 is suitably driven at proper speed to pull strip 45through guide means 2H3 under desirable tension, the yielding mountingof roller 223 permitting slippage suflicient to prevent tearing orbreaking of the strip gripped between the rollers 222 and 223; asdisclosed in my above identified patent.

The strip 45 passes from the guide means 2H3 between a pair of cuttingrolls comprising an upper plate roll 235 and a lower die roll 236. Plateroll 235 is secured on a shaft 231 rotatably mounted in bearing blocks238 constutiting the side members of a rectangular frame 239 dependingfrom two I-beams, one of which is shown at 240. Bearing blocks 238 arebolted or otherwise suitably secured to I-beams 249, and the latter seatupon cross I-beams 200 and 24! of the main frame 35. A bearing block 242is secured to and depends from each of the bearing blocks 238, and aspacer 243 is secured to the underface of each bearing block 242, frame229, formed in two sections, being suitably secured to bearing blocks242 and spacers 243. The parts referred to may be secured together as bybolting or any other suitable manner and the frame 229 provides asupport for the cross rods 2!!! and related parts, for the guide means210.

Die roll 236 is secured on a shaft 245 rotatably mounted adjacent eachend in a bearing block 246 slidable on guide rods 24! secured to anddepending from bearing block 233. Rods 241 have their lower portions241a reduced in diameter and are threaded at their lower ends forreception of nuts 248 which bear against the underface of a cross bar249 slidable on the rods. A coil compression spring 250 is mounted abouta plunger rod 25! disposed between rods 241 and slidable throughcrossbar 249 and an upper guide plate 252 suitably secured on rods 241.The upper end of plunger rod 25! bears against the underface of bearingblock 245 and spring 252 is confined between cross bar 249 and a collar253 on plunger rod 25!. Die roll 236 is thus provided with a floatingmounting at each end and is yieldingly urged upward toward the plateroll 235 in an obvious manner. By means of the nuts 248 the compressionof spring 255 may be varied to suit requirements.

Die roll 236 has mounted therein, in a suitable known manner, twodiametrically opposite die blocks 255, the outer faces of which areflat. Each block 255 carries three cutting dies 255 A gear 258 (Figure2) is secured on shaft 237- adjacent each end of plate roll 235 and abearing disc or rail 259 is secured to each end of plate roll 235. Thegears 258 mesh with gears 26ft secured on shaft 245 of die roll 235adjacent each end thereof, one of such gears 26f! being shown somewhatin Figure 2. A bearing disc or rail 26! is secured to each end of dieroll 236 and is maintained in bearing contact with the circumferentialsurface of the corresponding rail 259 on shaft 23'! by the compressionspring 25!! in an obvious manner. The rails 259 are of circular shapethroughout their extent, the pitch circle of the respective gears 258corresponding to the contour of the associated rails 259. Each of therails 26! is provided with two flat areas 26M corresponding to the flatouter faces of the die blocks 255. The pitch contour of the teeth ofeach of the gears 25!! corresponds to the contour of the adjacent rail26!, this gear accordingly having two fiat areas corresponding to areas265a of rail 26f. Plate roll 235 has mounted thereon, in any suitableknown manner, two diametrically opposite cutting plates 262 conformingin curvature to roll 235, the outer faces of these plates being flushwith the outer circumferential faces of the railst259, as shown moreclearly in Figures 1 and 3.

Gears 253 mesh with pinions (not shown) secured on a countershaft Z66rotatably mounted parallel with shaft 23?. Countershaft 285 is drivenfrom a rotatably mounted shaft 26? in a suitable known manner,convenientlyby chain and sprocket means. rails 259 and plate roll 235,are driven in clockwise direction, as viewed in Figure 2, and serve todrive gears 268, and with them rails 26!! and die roll 2%, incounterclockwise direction. The

guide means 255] directs the strip 35 between t the rolls 235 and 2 36and positions it accurately for cutting by the dies 256. In the rotationof the cutting rolls, the strip is cut into suitable Gears 258, and withthem lengths to provide blanks having each end more or less rounded andprovided with a substantially hook-shaped slit with a short central slithookshaped extending from the inner hook portion of one of the slits,produced by a corresponding extension of the following portion ofcutting die 25s, as will be clear from Figure 4.

The blanks pass from the cutting rolls to blank guide means 215, thencebetween upper and lower rubber covered gripping rollers 282 and 283,respectively, similar to rollers 222 and 223,

supported from frame 229. Roller 282 is driven at such speed that theblank severed from strip 85 is advanced at increased speed, so that thecut blanks are thus spaced a short distance apart.

The rollers 282 and 283 deliver the blanks in spaced apart relation tosuitable guide means 3M, from which the blanks pass between the upperand lower runs of upper and lower endless belts 346 and 3 respectively,of a transfer unit 332 provided, at each side, with a bolting flange 3&3seating upon and bolted to an angle cross member 344 of the main frame35. I'he transfer unit conveys the blanks to forming means by which theyare formed to desired shape. The guide means 215, rollers 282 and guidemeans 39!], transfer unit 343, and associated parts, and the formingmeans, are all described in detail in my above identified patent andneed not be further described here.

As previously mentioned, the following portion of die 255 (Figure l) hasassociated therewith an elastic cushion 25?. As the dies and the platesof the cutting rolls come into register, plate 252 rolls across thedies, which are urged toward the plate by spring pressure in the mannerpreviously described, roll 236 moving upward abruptly so as to, ineffect, strike the strip 45 a sharp blow with the die. This assuresclean and accurate cutting of the strip. Since the forward portion ofthe strip is, at that time, gripped between the pulling rolls 282 and283, the following end of the blank thus produced will be pulled free ofthe cutting rolls. In order to assure the succeeding blank will enterthe guide means 2% properly, it is desirable that means he provided toforce out of the dies the end portion of the strip which is to be theleading end of the next succeeding blank. When this cut made by thefollowing portion of die 258, the cushion 25? is compressed and, as soonas the die 256 and the plate 262 pass out of cooperating relation,cushion 251 expands forcing the cut end portion of the strip out of thedie, thus assuring that this end of the strip willvclear the cuttingrolls and pass into the guide means 215.

It will be understood that changes in construction and arrangement ofparts of my invention may be resorted to without; departing from thefield and scope thereof, and I intend to include all such variations, asfall within the scope of the appended claims, in this application inwhich the preferred form only of my invention has been disclosed.

I claim:

1. In a machine of the character described, cutting means comprising aplate roll and a cooperating die roll geared together, die blockscarried by said die roll, cutting dies in said blocks projecting beyondthe outer faces thereof, bearing rails secured to said die roll providedwith flats corresponding to said blocks and otherwise of circularcontour, bearing rails of circular contour secured to said ,plate rolland bearing upon said die roll rails, and means yieldingly urging saiddie roll toward said plate roll.

2. In a machine of the character described, cutting means comprising aplate roll and a cooperating die roll, die blocks carried by said dieroll, cutting dies carried by said blocks projecting beyond the outerfaces thereof, bearing rails secured to said die roll having flatscorresponding to said blocks and otherwise of circular contour, gearssecured to said die roll having the pitch contour of their teethcorresponding to the contour of said die roll rails, circular railssecured to said plate roll bearing on said die roll rails, gears securedto said plate roll meshing with said die roll gears and having the pitchcontour of their teeth corresponding to the contour of said plate rollrails, and means yieldingly urging said die roll toward said plate roll.

3. In a machine of the character described, cutting means comprising aplate roll and a coroll, cutting dies carried by said blocks project ingbeyond the outer faces thereof, bearing rails secured to said die r011having flats corresponding to said blocks and otherwise of circularcontour, gears secured to said die r011 having the pitch contour oftheir teeth corresponding to the contour of said die r011 rails,circular rails secured to said plate r011 bearing on said die r011rails, gears secured to said plate r011 meshing with said die r011 gearsand having the pitch contour of their teeth corresponding to the contourof said plate r011 rails, and means yieldingly urging said die r011toward said plate roll, the depth of the teeth of said gears and saidrails being so related as to prevent bottoming of said gear teeth.

LAWRENCE A. MOORE.

